Justin Harvey Smith was an influential American historian renowned for his expertise on the Mexican–American War. Born in Boscawen, New Hampshire, he pursued higher education at Dartmouth College, where he earned both his bachelor's and master's degrees. Smith's academic career included a tenure as Professor of Modern History at Dartmouth from 1899 to 1908, after which he dedicated himself to historical research. His notable works include 'The Annexation of Texas' (1911) and 'The War with Mexico' (1919), the latter of which garnered him the Pulitzer Prize in 1920 and the inaugural Loubat Prize in 1923, solidifying his reputation in the field of American history. In addition to his major works, Smith contributed to historical scholarship through titles such as 'Our Struggle for the Fourteenth Colony' (1907) and 'Arnold's March from Cambridge to Quebec' (1903). His meticulous research and insightful analysis provided a deeper understanding of pivotal events in American history. Beyond his writing, Smith played a significant role in the American Historical Association as chairman of the Historical Manuscripts Commission from 1917 to 1923. His legacy endures through his contributions to the study of American history, particularly regarding the complexities of U.S.-Mexico relations during the 19th century.